"Named c1853 by Captain Richards, British Admiralty, after Aaron Arrowsmith (1750-1823) and his nephew John A. Arrowsmith, noted English cartographers. The former was born in 1750 at Winston, Durham. From an obscure beginning, he rose, by diligence and industry, to great prosperity; his publications, topographic and hydrographic maps and charts, were noted for the accuracy and care with which they were constructed (Naval Chronicle, 1810, Col.24, p.223). He executed upwards of 130 maps, his general atlas appearing in 1817. Died at London, 1823. His nephew, John, also published a number of cartographic works, and was one of the founders of the Royal Geographical Society. Arrowsmith's maps and charts were universally known for their excellence in the first half of the last century, such that the name of Arrowsmith was often synonymous with everything clever and accurate in cartography."
Source: Walbran, John T; British Columbia Coast Names, 1592-1906: their origin and history; Ottawa, 1909 (republished for the Vancouver Public Library by J.J. Douglas Ltd, Vancouver, 1971)